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Nuclear spin can be calculated by finding number of protons and neutrons. It is calculated according to distribution of unpaired protons in energy levels. If protons and neutrons are equal in number net spin is zero and it is 1/2, 3/2 . if number of proton is odd (unpaired proton present). Dave Consiglio.

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Jan 13,  · nuclear spin = 1/2,5/2,7/2 the reason being it is the total nuclear spin means I= j = L+s the given example will tell you what is the difference between nuclear spin and spin of nucleon oxygen O(z=8,n=9,A=17) what you except its spin,i think =1/2(you are right) but it is not nuclear spin because nuclear spin is I=L+s.